Properties of entangled states based on nonorthogonal states are clarified. Especially, it is shown that they can have complete degree of entanglement.
@article{arxiv.quant-ph/0101018,
title = {Entangled state based on nonorthogonal state},
author = {Osamu Hirota and Masahide Sasaki},
journal= {arXiv preprint arXiv:quant-ph/0101018},
year = {2007}
}